Final answer:
The exception among the statements about eukaryotes is that eukaryotes are similar to prokaryotes at a molecular level.
Step-by-step explanation:
The exception among the statements about eukaryotes is that eukaryotes are similar to prokaryotes at a molecular level.
While it is true that eukaryotes have a nucleus (statement 1), can sometimes be unicellular (statement 3), are similar to prokaryotes at a structural level (statement 4), and include plants, fungi, and protists (statement 5), they are not similar to prokaryotes at a molecular level.
Eukaryotes and prokaryotes differ significantly in the complexity and organization of their cellular structures, including the molecular processes that occur within the cells.